import { useEffect, useRef, useState } from "react";
import { Navigate, NavLink, Route, Routes, useLocation } from "react-router-dom";
import { useAuth } from "./auth";
import { ChangeCredentials } from "./pages/ChangeCredentials";
import { GamePage } from "./pages/GamePage";
import { Library } from "./pages/Library";
import { Login } from "./pages/Login";
import { NewGame } from "./pages/NewGame";
import { ModEditor } from "./pages/ModEditor";
import { Play } from "./pages/Play";
import { Roles } from "./pages/Roles";
import { Saves } from "./pages/Saves";
import { TranslationEditor } from "./pages/TranslationEditor";
import { Users } from "./pages/Users";
import { useTheme } from "./theme";
import { Icon } from "./ui/Icon";
import { useSpatialNav } from "./ui/nav";
import { THEME_ICON, THEME_LABEL } from "./ui/ThemeButton";
import { UploadProvider } from "./uploads";

function RequirePerm({ perm, children }: { perm: string; children: JSX.Element }) {
  const { can } = useAuth();
  return can(perm) ? children : (
    <div className="page"><p className="muted">Нет доступа к этой странице.</p></div>
  );
}

function UserMenu() {
  const { me, logout, can } = useAuth();
  const { choice, cycle } = useTheme();
  const [open, setOpen] = useState(false);
  const ref = useRef<HTMLDivElement>(null);
  const { pathname } = useLocation();

  useEffect(() => setOpen(false), [pathname]);
  useEffect(() => {
    if (!open) return;
    const onDown = (e: MouseEvent) => !ref.current?.contains(e.target as Node) && setOpen(false);
    const onKey = (e: KeyboardEvent) => e.key === "Escape" && setOpen(false);
    document.addEventListener("mousedown", onDown);
    document.addEventListener("keydown", onKey);
    return () => {
      document.removeEventListener("mousedown", onDown);
      document.removeEventListener("keydown", onKey);
    };
  }, [open]);

  if (!me) return null;
  return (
    <div className="menu" ref={ref}>
      <button className="btn btn-ghost menu-trigger" onClick={() => setOpen((o) => !o)}
              aria-haspopup="menu" aria-expanded={open} aria-label="Меню профиля">
        <span className="avatar">{me.username[0]?.toUpperCase()}</span>
        <span className="menu-label">{me.username}</span>
        <Icon name="chevron" size={14} className="menu-chevron" style={{ transform: "rotate(90deg)" }} />
      </button>
      {open && (
        <div className="menu-panel" role="menu">
          <div className="menu-head">
            <b>{me.username}</b>
            <div className="muted small">{me.role.name}</div>
          </div>
          <NavLink to="/account" className="menu-item" role="menuitem"><Icon name="key" size={18} />Аккаунт и пароль</NavLink>
          <NavLink to="/saves" className="menu-item" role="menuitem"><Icon name="download" size={18} />Сохранения</NavLink>
          {(can("users.manage") || can("roles.manage")) && <div className="menu-section">Администрирование</div>}
          {can("users.manage") && (
            <NavLink to="/admin/users" className="menu-item" role="menuitem"><Icon name="users" size={18} />Пользователи</NavLink>
          )}
          {can("roles.manage") && (
            <NavLink to="/admin/roles" className="menu-item" role="menuitem"><Icon name="shield" size={18} />Роли и права</NavLink>
          )}
          <div className="menu-sep" />
          <button className="menu-item" role="menuitem" onClick={cycle}>
            <Icon name={THEME_ICON[choice]} size={18} />{THEME_LABEL[choice]}
          </button>
          <button className="menu-item danger" role="menuitem" onClick={() => void logout()}>
            <Icon name="logout" size={18} />Выйти
          </button>
        </div>
      )}
    </div>
  );
}

export function App() {
  const { me, loading, can } = useAuth();
  useSpatialNav();
  if (loading) return <div className="center"><span className="spinner" /></div>;
  if (!me) return <Login />;
  if (me.must_change_password || me.must_change_username) return <ChangeCredentials forced />;

  return (
    <UploadProvider key={me.id}>
    <Routes>
      <Route path="/play/:versionId" element={<RequirePerm perm="games.play"><Play /></RequirePerm>} />
      <Route
        path="*"
        element={
          <div className="layout">
            <header className="topbar">
              <NavLink to="/" className="brand">
                <span className="brand-mark"><Icon name="play" size={16} /></span>PGames
              </NavLink>
              <nav aria-label="Основная навигация">
                <NavLink to="/" end className="nav-link"><Icon name="library" size={18} />Библиотека</NavLink>
                {can("games.upload") && (
                  <NavLink to="/games/new" className="nav-link"><Icon name="upload" size={18} />Загрузить игру</NavLink>
                )}
              </nav>
              <UserMenu />
            </header>
            <main>
              <Routes>
                <Route path="/" element={<RequirePerm perm="games.play"><Library /></RequirePerm>} />
                <Route path="/games/new" element={<RequirePerm perm="games.upload"><NewGame /></RequirePerm>} />
                <Route path="/games/:gameId" element={<RequirePerm perm="games.play"><GamePage /></RequirePerm>} />
                <Route path="/versions/:versionId/translate" element={<RequirePerm perm="games.play"><TranslationEditor /></RequirePerm>} />
                <Route path="/versions/:versionId/edit" element={<RequirePerm perm="games.play"><ModEditor /></RequirePerm>} />
                <Route path="/admin/users" element={<RequirePerm perm="users.manage"><Users /></RequirePerm>} />
                <Route path="/admin/roles" element={<RequirePerm perm="roles.manage"><Roles /></RequirePerm>} />
                <Route path="/account" element={<ChangeCredentials />} />
                <Route path="/saves" element={<Saves />} />
                <Route path="*" element={<Navigate to="/" replace />} />
              </Routes>
            </main>
            <nav className="tabbar" aria-label="Нижняя навигация">
              <NavLink to="/" end><Icon name="library" />Библиотека</NavLink>
              {can("games.upload") && <NavLink to="/games/new"><Icon name="upload" />Загрузить</NavLink>}
              {can("users.manage") && <NavLink to="/admin/users"><Icon name="users" />Люди</NavLink>}
              {can("roles.manage") && <NavLink to="/admin/roles"><Icon name="shield" />Роли</NavLink>}
              <NavLink to="/account"><Icon name="user" />Профиль</NavLink>
            </nav>
          </div>
        }
      />
    </Routes>
    </UploadProvider>
  );
}